You know, based off these comments, nothing really sounds that bad. As a frame of reference
1) I already buy premium gas for my car, and I suspect when boosting enough (which I'm guilty of every single tank), I get around the same gas mileage as you guys (about 22-24 right now)
2) Tires are one thing I already expect to be pricey - I just spent $750 on summer tires/mounted on my car, and I would already suspect that a Z's tires would cost a bit more than that being larger/wider
3) Oil change doesn't sound so bad as I already buy 5qts of nice oil for my car now, I assumed for some unknown reason that everyone was dumping in that $16/qt oil
4) Mod prices for this car vs. my civic are surprisingly not that different. I made this comment on the civic forum a while ago when I noticed you guys have a lot of FI kits that cost less than what I paid to turbo my car. Of course, other things like exhausts cost 2x as much as a civic's does.. but mods are so extraneous that I wouldn't really worry about that
I've also been factoring in expenses on a brand new Nismo Z, which was looking like almost 40k from the dealer after TTL. Realistcally, if I do go with this car, I'm probably going to buy a used Sport or Sport/Touring closer to 25-30k since I can't even justify a Sport Z at 23, let alone a Nismo
Thanks for the input